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(No Model.) 5 Sheets-Sheet 2.

G. J. CARTWRIGH'T.

BOILER FURNAGE. No. 460,359. Patented Sept. 29, 1891.

l0 z'tn esses: Inventor:-

(2x1 MA I i attorneys,

(N0 Mode 1.) 5 Sheets-Sheet 4. G. J; GARTWR T.

BOILER PURNA Patented Sept. 29, 1891.

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Witnesses? Inventor:- U. wan/Q v l, Y V

UNITED STATES PATENT OFFICE.

GEORGE J OARTWRIGHT, OF SYDNEY, NE\V SOUTH ALES.

BOILER-FU RNACE.

SPECIFICATION forming part of Letters Patent No. 460,359, dated September 29, 1891. Application filed July 23,1890. 'Serial No. 359,591. (No model.)

boiler-furnaces and the consumption or the.

suppression of the thick volumes of smoke that issue from the smoke-stack when fresh fuel is added to the fire are problems that have long exercised the ingenuity of those most interested; but up to the present time no satisfactory solution of the difficulty has been arrived at. It is with a view to overcome the inherent difficulties hitherto unsatisfactorily encountered that the present arrangement of apparatus or appliances has been devised.

The invention consists, essentially, in a modification of existing appliances in connection with boilers and boiler-furnaces, whereby a direct auxiliary connection is established (through a box or chamber fixed on the front of the boiler) between the combustioirchamber at the rear of the boiler and the mouth of the furnace, in combination with a hollow firebridge, through which heated air may be admitted from the ash-pit to the furnace. The number of different classes of boiler is almost legion, and, as it would be manifestly impossible to describe the apparatus as applied to every class, I will confine myself to describing the mannerin which the invention is applied to the classes of boiler inmost extensive useviz., an ordinary Cornish or Lancashire boiler, or an externally-fired multitubular boiler.

In the accompanying drawings, Figure 1. is a longitudinal vertical section of an ordinary Cornish boiler, showing one of the side lines in dotted lines and a section of the hollow fire-bridge, the section being taken through the air-passage therein on the line 1 2 of Fig. 2. Fig. 2 is a half front elevation and half cross-section taken on the line 3 4. of Fig. 1, the front elevation showing the connection between the side flue and the front of the furnace, while the sectional part shows one of the side fines, the air-opening into the bridge below the fire-bars, the bottom flue, and its connection with the side lines. Fig. is a half plan and half horizontal section, the section being taken on the line 5 6 of Fig. 2, and shows the disposition of one of the side fines, I the passage between the side fine and the bottom fine, and thebottom flue itself. f is a vertical cross-section through the combustion-chamber at the rear of the boiler, taken on the line 78 of Fig. 1.

Fig. 4

Fig. 5 is a longitudinal vertical section of a multitubular externally-fired boiler, taken on the line 0 10 of Fig.6. Fig. 6 is a cross-section taken on the line 11 12 of Fig. 5. Fig. 7 is a sectional plan taken on the line 13 let of Fig. 5 and showing the arrangement of the fines and tubes, the direction of travel of the gases, and

the opening from the box or chamber in. front of theboiler to the mouth of the furnace. Figs. 8, 9, and 10 are details, on an enlarged scale, of the opening leading to the month of the furnace from the box or chamber, and the damper by which the passage of the hot gases is controlled.

In Figs. 1 to l, A is the brick-work setting of the boiler; 13, the boiler itself; 0, the firetube containing the furnace C; D, the hollow bridge; D, the air-passage through it. E E are the side flues, which terminate in front in pipe connections F F, that lead down from a box or chamber G, that is attached to the front of the boiler above the furnace-door II. J J are passages or fines that lead from the side lines E E into the bottom fine .I'. l

The space O behind the bridge in the firetube 0 serves as a combustion-chamber and opens into a rear combustion-chamber K,

which may be built in the brick-Work at the rear end of the boiler. The side fines E E lead back from the combustion-chamber K toward the front of the boiler and are connected with the mouth of the furnaceby the pipe connections F F and the box or chamber G, the inner side of which is open, so as to form a direct open connection between the mouth of the furnace and the side fines E E, that lead into the rear combustion-chamber K. O11 the furnace 0 being fired up the smoke and unconsumed products of comhot air that will materially assist combustion at the bridge and in the chamber 0 These heated gases will then enter the chamber K, from whence they will pass along the side flues E E toward the front of the boiler, then into the passages J J, and from thence into the bottom flue J. NVhilein the passages J J the gases arriving from the combustion-chamber K will meet other hot gases that are sucked by the draft from the mouth of the furnace 0 through the box or chamber G down the connection-pipes F F. The amalgamation of the gases at these points will resultin ignition, thus causing a great development of heat in the bottom flue J beneath the boiler. The admission of the heated gases from the front of the furnace C to the passages JJ through the connection-pipes F F is regulated and governed by the valves or dampers f f, that are preferably placed in the connection-pipes F F, so that they may be operated with facility by the fireman. Fresh hot atmospheric air is admitted to the bridge D-through the air-passage D, the admission of the air being regulated and governed by the damper d, that is operated from the front of the furnace by the rod and handle d.

The muititubular externally-fired boiler shown in Figs. 5, 6, and 7'exhibits the invention applied in a somewhat different manner. 0 is the furnace. D is the bridge; D, the air-passage; (Z, the damper; (1, the rod and handle by which the damper is operated. C and K form a combustion chamber. The heated gases pass from K along the fire-tubes M into the box or chamber G, where they divide and pass along the side fiues E E into the rear combustionchamber Z, and from thence to the smoke-stack. The necessary connection between the mouth of the furnace and the box or chamber G is eifected by means of an opening g, leading from the box or chamber G into the mouth of the furnace.

The casting in which the opening g is preferably formed is shown in enlarged detached views at Figs. 8, 9, and 10, the plan view at at Fig. 8 showing the baffle-plate or damper g half-opened. The passage of the heated gases from the mouth of the furnace into the box or chamber G (and from thence to the side fines E E) is governed and regulated by the damper or baffle-plate g.. The amalgamation of the heated gases arriving from chamber K with the gases from the mouth of the furnace will take place at the entrance to the side fines E E, which in this instance have the same function as the bottom line J in Figs. 1 and 2.

Having now particularly described and as: certained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- The combination, with the furnace and boiler, of a combustion-chamber G the hollow bridge-wall D in said chamber and having the air-passage D, the rear combustionchamber K, connected therewith, passages for the products of combustion leading from said chamber K to the front of the boiler, the box G, connected with said passages, an opening g from the furnace into said box, a valve g for said opening to control the supplemental combustion in the box, and apassage extending rearward and external to the boiler from the box G to the escape-flue, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

GEORGE J. CARTWRIGHT.

Witnesses:

MANFIELD NEWTON, C. E., WM. D. MAssoUP. 

